The term 'stop from happening' can be expressed in three different ways: AVERT (5 letters), KIBOSH (6 letters), and PREVENT (7 letters). AVERT is derived from the Latin word avertere, which means to turn away. KIBOSH is a slang term that originated in the 19th century and is used to mean to put an end to something. PREVENT is a more common term that means to stop something from occurring. All three terms are used to describe the same concept of stopping something from happening.